The biological state estimating device (1) has a pair of electrocardiographic electrodes (11, 12) for detecting an electrocardiographic signal, a light emitting element (21) and a light receiving element (22), and detects a photoelectric pulse wave signal A peak detecting unit (316, 326) for detecting the peaks of the electrocardiogram signal and the photoelectric pulse wave signal respectively a peak detecting unit (316, 326) for detecting peaks of the photoelectric pulse wave signal and the peak of the electrocardiogram signal A pulse wave propagation time measuring unit (330) for obtaining a pulse wave propagation time from the pulse wave propagation time, a correlation information storage unit (341) for storing correlation information predetermined on the basis of the relationship between the pulse wave propagation time and the biological state, And a biological state estimating section (360) for estimating the biological state of the user based on the pulse wave propagation time and the correlation information stored in the correlation information storage section (341).生体状態推定装置(1)は、心電信号を検出する一対の心電電極(11,12)と、発光素子(21)と受光素子(22)とを有し、光電脈波信号を検出する光電脈波センサ(20)と、心電信号、及び、光電脈波信号それぞれのピークを検出するピーク検出部(316,326)と、光電脈波信号のピークと心電信号のピークとの時間差から脈波伝播時間を求める脈波伝播時間計測部(330)と、脈波伝播時間と生体状態との関係に基づいて予め定められた相関情報を記憶する相関情報記憶手部(341)と、脈波伝播時間、及び相関情報記憶部(341)に記憶されている相関情報に基づいて、使用者の生体状態を推定する生体状態推定部(360)とを備える。
